diff --git a/pagure/api/fork.py b/pagure/api/fork.py
index 52b5bd2..4f35112 100644
--- a/pagure/api/fork.py
+++ b/pagure/api/fork.py
@@ -477,6 +477,9 @@ def api_pull_request_add_comment(repo, requestid, username=None):
             )
             SESSION.commit()
             output['message'] = message
+        except pagure.exceptions.PagureException as err:
+            raise pagure.exceptions.APIError(
+                400, error_code=APIERROR.ENOCODE, error=str(err))
         except SQLAlchemyError, err:  # pragma: no cover
             APP.logger.exception(err)
             SESSION.rollback()